The production of advanced fine-grained alumina by carbon nanotube addition

Fawad Inam, Ton Peijs, Michael Reece

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Alumina and alumina + 1 vol.% carbon nanotube (CNT) composites were fully densified by spark plasma sintering. Post-sintering heat treatments (1300–1500 °C) were performed to completely oxidize CNTs and then densify the remaining 1 vol.% to produce fine-grained ceramics. The grain size and Vickers hardness of the heat-treated composites were compared with the monolithic alumina sintered without CNT addition. Compared to the initial powder particle size of alumina (D50: 356 ± 74 nm), minimal grain growth (∼450 nm) was observed for the fully dense heat-treated composites. A 25% improvement in Vickers hardness and >10 times finer average grain size were observed for alumina produced by the heat treatment (1300 °C) of alumina + 1 vol.% CNT composite, compared to alumina sintered without CNTs.
Original languageEnglish
Pages (from-to)2853-2859
JournalJournal of the European Ceramic Society
Volume31
Issue number15
DOIs
Publication statusPublished - 2011

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